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Lordy. Are you kidding me?
Of course it is possible...AAMOF, for most KitKat ROMs on the Sprint SPH-L900 enabling ART WILL render your ROM unbootable and the only "fix" (that I know of) is a Nandroid restore. AFAIK the only ROM for L900 with working ART that I know of is OmniROM, although I will admit I haven't tried straight CyanogenMod in forever. "Working" meaning enabling ART doesn't break your ROM. Because what will happen otherwise is after enabling ART and immediately rebooting, your ROM install will permanently bootloop, and the only way of getting it back is Nandroid recovery.
Don't believe me? Download or read the XDA forums for Dirty Unicorns 5.0 or SlimKat (no offense intended at Maz or sleshy who do mad work on those ROMs and who are more than aware of this issue). Then you'll see exactly what I'm talking about and that it is you who are "spreading false information". Further even within the same ROM, enabling ART can break the ROM for some devices but not others. If you read or follow Google+ dev communities for OmniROM and others you'd know this.
"False information" indeed.